<template>
    <div>
       <!--面包屑导航区-->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示信息 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'" style="height: 550px;"
                :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader expand-trigger="hover" v-model="addForm.goods_cat" :options="catelist" :props="cateProps"
                            @change="handleChange">
                        </el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的Item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox v-for="(cb,i) in item.attr_vals" :key="i" :label="cb" border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action 表示图片要上传到后台的API地址 -->
                    <el-upload :action="uploadURL" :on-preview="handlePreview"
                        :on-remove="handleRemove" list-type="picture" :headers="headerObj" 
                        :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本编辑器 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
            title="图片预览" :visible.sync="previewVisible" width="50%">
            <img :src="previewPath" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>

export default {
    data() {
        return {
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                attrs: []
            },
            addFormRules: {
                goods_name:[
                    {required:true, message:'请输入商品名称', trigger:'blur'}
                ],
                goods_price:[
                    {required:true, message:'请输入商品价格', trigger:'blur'}
                ],
                goods_weight:[
                     {required:true, message:'请输入商品重量', trigger:'blur'}
                ],
                goods_number:[
                     {required:true, message:'请输入商品数量', trigger:'blur'}
                ],
                goods_cat:[
                    {required:true, message:'请选择商品分类', trigger:'blur'}
                ]
            },
            // 商品分类列表
            catelist: [],
            cateProps: {
                label: 'cat_name',
                value: 'cat_id',
                chilidren: 'children'
            },
            // 动态参数列表数组
            manyTableData: [],
            // 静态属性列表数组
            onlyTableData: [],
            // 这是upload上传地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 这是图片上传的header请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList() {
          const { data:res } = await this.$axios.get(`categories`)
          if (res.meta.status !== 200) {
              return this.$message.error('获取商品分类失败')
          }
            this.catelist = res.data
            console.log(this.catelist)
        },
        // 级联选择器选中项变化会触发这个函数
        handleChange() {
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName, oldActiveName) {
            // console.log("即将离开的标签页面是" + oldActiveName)
            // console.log("即将进入的标签页面是" + activeName)
            // return false
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        async tabClicked() {
            //  console.log(this.activeIndex)
            //  访问的是动态参数面板
            if (this.activeIndex === '1') {
               const {data: res} = await this.$axios.get(`categories/${this.cateId}/attributes`, {params: {sel: 'many'}})
               if (res.meta.status !== 200) {
                   return this.$message.error('获取动态参数列表失败')
               }
               console.log(res.data)
               res.data.forEach(item => {
                item.attr_vals = item.attr_vals === 0 ? [] : item.attr_vals.split(' ')
               })
               this.manyTableData = res.data
            }
             else if (this.activeIndex === '2') {
               const { data:res } = await this.$axios.get(`categories/${this.cateId}/attributes`, {params: {sel: 'only'}})
               if (res.meta.status !== 200) {
                   return this.$message.error('获取静态属性失败')
               }

               console.log(res.data)
               this.onlyTableData = res.data
             } 
        },
        // 处理图片预览效果
        handlePreview(file) {
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // 1.获取将要删除的图片的临时路径
            const filepath = file.response.data.tmp_path
            // 2. 从pics 数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filepath)
            // 3.调用数组的splice方法，把图片信息对象，从Pics数组移除
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },
        // 监听函数上传成功的事件
        handleSuccess(response) {
            console.log(response)
            // 1.拼接得到一个图片信息对象
            const picInfo = {pic : response.data.tmp_path}
            // 2.将图片信息对象Push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        add() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) {
                    return this.$message.error('请填写必要的表单项')
                }
                // 执行添加的业务逻辑
                // loadsh cloneDeep(obj)
               const form = _.cloneDeep(this.addForm)
               form.goods_cat = form.goods_cat.join(',')
               // 处理动态参数和静态属性
               this.manyTableData.forEach(item => {
                   const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals.join(' ')}
                   this.addForm.attrs.push(newInfo)
               })
               this.onlyTableData.forEach(item => {
                   const newInfo = {attr_id: item.attr_id, attr_value: item.attr_vals}
                   this.addForm.attrs.push(newInfo)
               })
               form.attrs = this.addForm.attrs
               console.log(form)

               // 发起请求添加商品
               // 商品名称，必须是唯一的
              const {data:res} = await this.$axios.post(`goods`, form)
              if (res.meta.status !== 201) {
                  return this.$message.error('添加商品失败')
              }
              this.$message.success('添加商品成功')
              this.$router.push('/goods')
            })
        }  
    },
    computed: {
        cateId() {
             if(this.addForm.goods_cat.length === 3) {
                 return this.addForm.goods_cat[2]
             }
             return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 10px 0 0 !important;
}

.previewImg {
    width: 100%;
}

.btnAdd {
    margin-top: 15px;
}
</style>